Summary
This security update resolves a vulnerability in Windows Service Control Manager (SCM). This vulnerability is caused when SCM incorrectly verifies impersonation levels. The vulnerability could allow elevation of privilege if an attacker can first log on to the system and then run a specially crafted application that is designed to increase privileges.
Introduction
Microsoft has released security bulletin MS15-050. To learn more about this security bulletin:
Home users:
https://www.microsoft.com/security/pc-security/updates.aspx Skip the details: Download the updates for your home computer or laptop from the Microsoft Update website now:
IT professionals:
How to obtain help and support for this security update
Help installing updates:
Support for Microsoft Update
Security solutions for IT professionals:
TechNet Security Troubleshooting and Support
Help protect your Windows-based computer from viruses and malware:
Virus Solution and Security Center
Local support according to your country:
International Support
More Information
Security update deployment information
Windows Vista (all editions)Reference table
The following table contains the security update information for this software.
| Security update file names | For all supported 32-bit editions of Windows Vista: Windows6.0-KB3055642-x86.msu |
|---|---|
| For all supported x64-based editions of Windows Vista: Windows6.0-KB3055642-x64.msu |
|
| Installation switches | See Microsoft Knowledge Base Article 934307 |
| Restart requirement | Yes, you must restart your system after you apply this security update. |
| Removal information | WUSA.exe does not support uninstall of updates. To uninstall an update that is installed by WUSA, click Control Panel, and then click Security. Under Windows Update, click View installed updates, and then select from the list of updates. |
| File information | See the file information section. |
| Registry key verification | Note A registry key does not exist to validate the presence of this update. |
Windows Server 2008 (all editions)Reference table
The following table contains the security update information for this software.
| Security update file names | For all supported 32-bit editions of Windows Server 2008: Windows6.0-KB3055642-x86.msu |
|---|---|
| For all supported x64-based editions of Windows Server 2008: Windows6.0-KB3055642-x64.msu |
|
| For all supported Itanium-based editions of Windows Server 2008: Windows6.0-KB3055642-ia64.msu |
|
| Installation switches | See Microsoft Knowledge Base Article 934307 |
| Restart requirement | Yes, you must restart your system after you apply this security update. |
| Removal information | WUSA.exe does not support uninstall of updates. To uninstall an update that is installed by WUSA, click Control Panel, and then click Security. Under Windows Update, click View installed updates, and then select from the list of updates. |
| File information | See the file information section. |
| Registry key verification | Note A registry key does not exist to validate the presence of this update. |
Windows 7 (all editions)Reference Table
The following table contains the security update information for this software.
| Security update file name | For all supported 32-bit editions of Windows 7: Windows6.1-KB3055642-x86.msu |
|---|---|
| For all supported x64-based editions of Windows 7: Windows6.1-KB3055642-x64.msu |
|
| Installation switches | See Microsoft Knowledge Base Article 934307 |
| Restart requirement | Yes, you must restart your system after you apply this security update. |
| Removal information | To uninstall an update that is installed by WUSA, use the setup switch. Or, click Control Panel, and then click System and Security. Under Windows Update, click View installed updates, and then select from the list of updates. |
| File information | See the file information section. |
| Registry key verification | Note A registry key does not exist to validate the presence of this update. |
Windows Server 2008 R2 (all editions)Reference Table
The following table contains the security update information for this software.
| Security update file name | For all supported x64-based editions of Windows Server 2008 R2: Windows6.1-KB3055642-x64.msu |
|---|---|
| For all supported Itanium-based editions of Windows Server 2008 R2: Windows6.1-KB3055642-ia64.msu |
|
| Installation switches | See Microsoft Knowledge Base Article 934307 |
| Restart requirement | Yes, you must restart your system after you apply this security update. |
| Removal information | To uninstall an update that is installed by WUSA, use the setup switch. Or, click Control Panel, and then click System and Security. Under Windows Update, click View installed updates, and then select from the list of updates. |
| File information | See the file information section. |
| Registry key verification | Note A registry key does not exist to validate the presence of this update. |
Windows 8 and Windows 8.1 (all editions)Reference Table
The following table contains the security update information for this software.
| Security update file name | For all supported 32-bit editions of Windows 8: Windows8-RT-KB3055642-x86.msu |
|---|---|
| For all supported x64-based editions of Windows 8: Windows8-RT-KB3055642-x64.msu |
|
| For all supported 32-bit editions of Windows 8.1: Windows8.1-KB3055642-x86.msu |
|
| For all supported x64-based editions of Windows 8.1: Windows8.1-KB3055642-x64.msu |
|
| Installation switches | See Microsoft Knowledge Base Article 934307 |
| Restart requirement | Yes, you must restart your system after you apply this security update. |
| Removal information | To uninstall an update that is installed by WUSA, use the /Uninstall setup switch. Or, click Control Panel, click System and Security, and then click Windows Update. Under See also, click Installed updates, and then select from the list of updates. |
| File information | See the file information section. |
| Registry key verification | Note A registry key does not exist to validate the presence of this update. |
Windows Server 2012 and Windows Server 2012 R2 (all editions)Reference Table
The following table contains the security update information for this software.
| Security update file name | For all supported editions of Windows Server 2012: Windows8-RT-KB3055642-x64.msu |
|---|---|
| For all supported editions of Windows Server 2012 R2: Windows8.1-KB3055642-x64.msu |
|
| Installation switches | See Microsoft Knowledge Base Article 934307 |
| Restart requirement | Yes, you must restart your system after you apply this security update. |
| Removal information | To uninstall an update that is installed by WUSA, use the /Uninstall setup switch. Or, click Control Panel, click System and Security, and then click Windows Update. Under See also, click Installed updates, and then select from the list of updates. |
| File information | See the file information section. |
| Registry key verification | Note A registry key does not exist to validate the presence of this update. |
Windows RT and Windows RT 8.1 (all editions)Reference Table
The following table contains the security update information for this software.
| Deployment | These updates are available through Windows Update only. |
|---|---|
| Restart Requirement | Yes, you must restart your system after you apply this security update. |
| Removal Information | Click Control Panel, click System and Security, and then click Windows Update. Under See also, click Installed updates, and then select from the list of updates. |
| File Information | See the file information section. |
File information
The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.
Windows Vista and Windows Server 2008 file information
The files that apply to a specific product, milestone (SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
Version Product Milestone Service branch 6.0.6002.18xxx Windows Vista SP2 and Windows Server 2008 SP2 SP2 GDR 6.0.6002.23xxx Windows Vista SP2 and Windows Server 2008 SP2 SP2 LDR GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
Note The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.
For all supported x86-based versions of Windows Vista and Windows Server 2008
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Services.exe | 6.0.6002.19369 | 279,552 | 10-Apr-2015 | 23:22 | x86 |
| Services.mof | Not Applicable | 2,866 | 18-Sep-2006 | 21:46 | Not Applicable |
| Services.exe | 6.0.6002.23677 | 280,576 | 10-Apr-2015 | 23:18 | x86 |
| Services.mof | Not Applicable | 2,866 | 07-May-2014 | 23:55 | Not Applicable |
For all supported x64-based versions of Windows Vista and Windows Server 2008
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Services.exe | 6.0.6002.19369 | 384,512 | 10-Apr-2015 | 23:33 | x64 |
| Services.mof | Not Applicable | 2,866 | 18-Sep-2006 | 21:44 | Not Applicable |
| Services.exe | 6.0.6002.23677 | 385,024 | 10-Apr-2015 | 23:44 | x64 |
| Services.mof | Not Applicable | 2,866 | 07-May-2014 | 23:55 | Not Applicable |
| Services.exe | 6.0.6002.19369 | 279,552 | 10-Apr-2015 | 23:22 | x86 |
| Services.mof | Not Applicable | 2,866 | 18-Sep-2006 | 21:46 | Not Applicable |
| Services.exe | 6.0.6002.23677 | 280,576 | 10-Apr-2015 | 23:18 | x86 |
| Services.mof | Not Applicable | 2,866 | 07-May-2014 | 23:55 | Not Applicable |
For all supported IA-64-based versions of Windows Server 2008
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Services.exe | 6.0.6002.19369 | 744,448 | 10-Apr-2015 | 23:23 | IA-64 |
| Services.mof | Not Applicable | 2,866 | 03-Jan-2008 | 19:17 | Not Applicable |
| Services.exe | 6.0.6002.23677 | 746,496 | 10-Apr-2015 | 23:22 | IA-64 |
| Services.mof | Not Applicable | 2,866 | 07-May-2014 | 23:54 | Not Applicable |
| Services.exe | 6.0.6002.19369 | 279,552 | 10-Apr-2015 | 23:22 | x86 |
| Services.mof | Not Applicable | 2,866 | 18-Sep-2006 | 21:46 | Not Applicable |
| Services.exe | 6.0.6002.23677 | 280,576 | 10-Apr-2015 | 23:18 | x86 |
| Services.mof | Not Applicable | 2,866 | 07-May-2014 | 23:55 | Not Applicable |
Windows 7 and Windows Server 2008 R2 file information
The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
Version Product Milestone Service branch 6.1.7601.18xxx Windows 7 and Windows Server 2008 R2 SP1 GDR 6.1.7601.22xxx Windows 7 and Windows Server 2008 R2 SP1 LDR GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
Note The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.
For all supported x86-based versions of Windows 7
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Services.exe | 6.1.7601.18829 | 259,072 | 13-Apr-2015 | 03:19 | x86 |
| Services.mof | Not Applicable | 2,866 | 04-Jul-2013 | 12:14 | Not Applicable |
| Services.ptxml | Not Applicable | 1,061 | 12-Apr-2015 | 22:32 | Not Applicable |
| Services.exe | 6.1.7601.23033 | 259,072 | 11-Apr-2015 | 03:53 | x86 |
| Services.mof | Not Applicable | 2,866 | 09-Jul-2013 | 06:07 | Not Applicable |
| Services.ptxml | Not Applicable | 1,061 | 10-Apr-2015 | 23:15 | Not Applicable |
For all supported x64-based versions of Windows 7 and Windows Server 2008 R2
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Services.exe | 6.1.7601.18829 | 328,704 | 13-Apr-2015 | 03:28 | x64 |
| Services.mof | Not Applicable | 2,866 | 04-Jul-2013 | 12:14 | Not Applicable |
| Services.ptxml | Not Applicable | 1,061 | 12-Apr-2015 | 22:32 | Not Applicable |
| Services.exe | 6.1.7601.23033 | 328,704 | 11-Apr-2015 | 04:31 | x64 |
| Services.mof | Not Applicable | 2,866 | 09-Jul-2013 | 06:15 | Not Applicable |
| Services.ptxml | Not Applicable | 1,061 | 10-Apr-2015 | 23:28 | Not Applicable |
For all supported IA-64-based versions of Windows Server 2008 R2
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Services.exe | 6.1.7601.18829 | 683,520 | 13-Apr-2015 | 02:21 | IA-64 |
| Services.mof | Not Applicable | 2,866 | 04-Jul-2013 | 12:22 | Not Applicable |
| Services.ptxml | Not Applicable | 1,061 | 12-Apr-2015 | 22:29 | Not Applicable |
| Services.exe | 6.1.7601.23033 | 683,520 | 11-Apr-2015 | 03:08 | IA-64 |
| Services.mof | Not Applicable | 2,866 | 09-Jul-2013 | 06:10 | Not Applicable |
| Services.ptxml | Not Applicable | 1,061 | 10-Apr-2015 | 23:13 | Not Applicable |
Windows 8 and Windows Server 2012 file information
The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
Version Product Milestone Service branch 6.2.920 0.16 xxx Windows 8 and Windows Server 2012 RTM GDR 6.2.920 0.20 xxx Windows 8 and Windows Server 2012 RTM LDR GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
Note The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.
For all supported x86-based versions of Windows 8
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Services.exe | 6.2.9200.17343 | 333,312 | 13-Apr-2015 | 04:06 | x86 |
| Services.exe | 6.2.9200.21456 | 332,288 | 12-Apr-2015 | 22:34 | x86 |
For all supported x64-based versions of Windows 8 and Windows Server 2012
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Services.exe | 6.2.9200.17343 | 417,280 | 13-Apr-2015 | 05:32 | x64 |
| Services.exe | 6.2.9200.21442 | 411,136 | 12-Apr-2015 | 22:31 | x64 |
Windows 8.1 and Windows Server 2012 R2 file information
For all supported x86-based versions of Windows 8.1
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Services.exe | 6.3.9600.17793 | 333,624 | 08-Apr-2015 | 22:59 | x86 |
For all supported x64-based versions of Windows 8.1 and Windows Server 2012 R2
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Services.exe | 6.3.9600.17793 | 410,128 | 08-Apr-2015 | 22:55 | x64 |
File hash information
| File name | SHA1 hash | SHA256 hash |
|---|---|---|
| Windows6.0-KB3055642-ia64.msu | A9D0AEEFC75C5925DBE16B9D14754BFD220FEE0A | 1A36443CB5B5D1D6517D2CA79FE375A42D1A4397E30F7465A11684D389258283 |
| Windows6.0-KB3055642-x64.msu | 05FBCC383DFE1E46ED7EDF23A9E9B775EE5242AB | AE965FC3BF5CF2EEEB754768E1B61BA05764403644436ECC1B32B66E3CECBDA2 |
| Windows6.0-KB3055642-x86.msu | 6F6C0687C22FBF63C90EAB8D84F80F726D983C43 | 85DD6C42FEDA9F2F56F79BC5A4089B4329B3866F177D7229472B58942A5F6B42 |
| Windows6.1-KB3055642-ia64.msu | AE806D548170FAC249B397C80933883A9F19B853 | C5F6CAD27C0664349A0BA62FEC0BD55BDCF5CAACEDA23EF862B83B2CF996B8C8 |
| Windows6.1-KB3055642-x64.msu | CC13DB5A18E3531C854E85263E66055CDD081678 | 3632699001A0360350881035AD07AFA96E7E958C41C13924060950D37C1576C2 |
| Windows6.1-KB3055642-x86.msu | 2F1AC561188E1AF40796273CE672DE6C73259202 | F4B2048C187D765153AD77F3F42CA6279BA8F83EBC89E50980F3423C8E47E866 |
| Windows8.1-KB3055642-x64.msu | DA4C9859885BC413462C7B73141CF42AAC807238 | 221F9AA57C2347C3CDF4AE26E58177D199201DC13D47A53E70BDF39443376B62 |
| Windows8.1-KB3055642-x86.msu | B448FC6FBD8B9BA0951DEDABF00DCD523163E8A4 | 9C6D430199A79B41AEE2D1B57C3DDB0EEE585F0E3523CFBC741741C819D2751B |
| Windows8-RT-KB3055642-x64.msu | B1ADE85117948215F943F4F2B15C3399BF0837D7 | EDA655683CA4139CA05FAF6C99AA39A6CBEBA9475C2A34A6CDCE437D64F35692 |
| Windows8-RT-KB3055642-x86.msu | 4AC05C6692ADD3B39082CF938BBB8FC52CBD7637 | DD5E9386B1A700EA4ADAB8994C55EB479507E04AAE97B2006E42E752FB6AB72A |